Question about Insignia NS-LCD37 37 in. LCD TV

4 Answers

I have a LCD TV NS-LCD37. I replace the TV Main Board model number 6HA0136910 TV work fine for couple week. Then TV lost sound I open back cover try reconnected all cables but when I turn on power light just blink and TV will not turn on. Therefore, I order and replace Main Unit board model 6HA0136911 power light on green but no picture, and no sound TV will not turn off manually. TV will only turn off by unplug power cord. I am really appreciating any help at this point. Thank You

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  • 2 more comments 
  • Paul001 Mar 17, 2011

    I did not have time to check Back Light Inverter. However, the power supply is new and all capacitors are in good condition. I bought it recently from Tri-State Modules with 6-month warranty. I still have another power supply board and will change power supply and check Backlight Inverter board tomorrow. Thank You





    Note: I did mention that TV would not turn off except by unplug power cord. In the past I replace Main Unit and it work with other brand of LCD TV.

    I did not have time to check Back Light Inverter. However, the power supply is new and all capacitors are in good condition. I bought it recently from Tri-State Modules with 6-month warranty. I still have another power supply board and will change power supply and check Backlight Inverter board tomorrow. Thank You



    Note: I did mention that TV would not turn off except by unplug power cord. In the past I replace Main Unit and it work with other brand of LCD TV.

  • Paul001 Mar 18, 2011

    I have replace Power Supply board and check Backlight Inverter both is good. I am not sure what gopakumarg43 mean Power Inverter board I am assumes Power to Backlight Inverter. Anyway, can you please explain to me as why Backlight Inverter prevents TV from turn off except by unplug power cord? In addition, one more thing I did not mention that I have no sound. I appreciated all of the help and advice but at this point, I think I received a defective Main Unit board. Thank You



    I have replace Power Supply board and check Backlight Inverter both is good. I am not sure what gopakumarg43 mean Power Inverter board I am assumes Power to Backlight Inverter. Anyway, can you please explain to me as why Backlight Inverter prevents TV from turn off except by unplug power cord? In addition, one more thing I did not mention that I have no sound. I appreciated all of the help and advice but at this point, I think I received a defective Main Unit board. Thank You


  • Paul001 Mar 18, 2011

    My Email is paul001@centurylink.net. I have replace Power Supply board and the other Power Supply board still under warranty. At this point, should I get another Power Supply board?

    My Email is paul001@centurylink.net. I have replace Power Supply board and the other Power Supply board still under warranty. At this point, should I get another Power Supply board?

  • Paul001 Mar 18, 2011

    I will get another Power Supply but one thing keep bothering me is those two Power Supplies just going out then some part must cause Power Supply to go out. Could it be the Main Unit model 6HA0136910 create some electrical fault in Backlight Inverter board some how damage Power Supply? If you do not think problem is with Main Unit board.

    I will get another Power Supply but one thing keep bothering me is those two Power Supplies just going out then some part must cause Power Supply to go out. Could it be the Main Unit model 6HA0136910 create some electrical fault in Backlight Inverter board some how damage Power Supply? If you do not think problem is with Main Unit board.

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4 Answers

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  • Insignia Master
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As in the first place I thin when the set was opened for solving the sound problem and reassembled the whole set worked with a difference.
To me it looks as though you need to recheck and redo the first job once again . Please have the power lines taken off and the charge in the main power supply section discharged.
Now look at all the connectors , the drivers, the possible heating areas. there is a high possibility that bad connections , loose connections or DRY solder joints are a possible issue. Use a good light to look into the circuits and the connections. Unless you can probe with a voltage /signal test, replacement of the whole board is not a solution as to the cost.
Since you have the two boards a cross check on the components can be done. Please check power to the processor section, check the oscillations on the crystal to confirm the working of the processor, and finally the drivers of the different stages.

Posted on Mar 19, 2011

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  • Master
  • 1,622 Answers

Hi,i think it's a Good idea.It's not worth all the stress your Going through..
Since it's on warranted,it's advice able to take it back for replacement..

Good luck..

Posted on Mar 18, 2011

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  • Insignia Master
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Hello
From your brief description I understands that, you have replaced the main board. It was working fine until last week too you reports. And the sound has gone off, and picture was there. I thinks that you have some technical skill and knoledge in eletronics, utherwise you can't do this. but after replacing the main board, for every LCD tv will need a firmwere update. You havent reporte about it, whether you have done it or not. anyway, this time, its power inverter board has the trouble. it is very difficult to descirbe all the details here, and as you know, there is no one sentence answer to any electronic device problems. have you its schematic diagram with you? In it, the company have described all the details, and can be get from electronic sparepart shops in book form. If you face any difficulty in getting the service manual of Insiginia, send a amil to me, and I'll send the service manual to you by return mail. i can't send it to you by this site, as the file is too large.
Anyway, check its power inverter board. it has the problem now. OK

Posted on Mar 18, 2011

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  • The Knight
    The Knight Mar 18, 2011

    gopakumarg43@ymail.com

  • The Knight
    The Knight Mar 18, 2011

    Sir
    There are two types of external power supplies to connect with TVs. In one type, there will be a mains transformer, rectifier diodes, and some regulaton components, to regulate the output DC voltage. On some otheres, there will be no mains transformer, and in place you can see a small transformer, a chopper transformer, usually called SMPS transformer, and its inverter secition. The mains AC voltage is first rectified and smoothed by capacitors, and this DC unregulated voltage will be chooped to square waves of desired amplitude and frequency, and then used to switch the SMPS transformer's primary windings, and the induced secondary high frequency AC volatage will be retifed again and givenas output. I meant the inverter board to this. If your external power supply box has power transformer, instead of SMPS, you can identify by its weight. SMPS types, will be very light, and a small verson of it we daily uses with to charge our cellphones. Inside it also is an inverter transformer and all the above said component, but will be very small. Anyway, power supply of your TV is in trouble. Whether it is SMPS type or of transformer type. Its service manual contains all except the external power supply unit. OK.

  • The Knight
    The Knight Mar 18, 2011

    I now understands that you are working on your TV without its schematics. Please send your mail address to me, if you don't have it with you. it will guide you properly I thinks. OK.

  • The Knight
    The Knight Mar 19, 2011

    I've send you its schematic diagram, and full service manual a few minutes ago by gmail. It is an adobe acrobat printable version, and you have to get installed adome verson-8 or above to read it properly, with chinese fonds to read it well. OK

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  • Master
  • 1,591 Answers

There's a good chance you have failing electrolytic capacitors either in the power section or the inverter section or both.
Any caps in these sections that look bulged at the top, or bulged/leaking at the bottom need to be replaced.
If you repeatedly turn it on, eventually it'll probably stay on, but every time you turn it off, the TV will get harder and harder to start up until one day it just won't.
Sometimes you have to do the opposite to start it up and unplug it for 5 mins, then try.

If you aren't tech savvy, this unit needs to go in for repair.

If you are handy with a soldering iron and can identify the power supply and inverter / FM section for the backlights, an inexpensive handful of capacitors will likely fix you right up.
Match the capacitance on the capacitors. Go over voltage if you can, and still have them fit.
IE - it's not a bad idea to replace a 10V cap with a 16V or 25V or even a 50V, but don't replace a 680uF cap with a 500uF or a 1000uF (unless you are positive it's only doing ripple filtering, and even then, you should go OVER, not under the uF rating).

Most of the caps that go are 10V 1000uF or 3300uF.

I found some great videos of the procedure (for many Samsungs with the same issue) on youtube.
http://www.youtube.com/watch?v=Mm51C_RDIZE
http://www.youtube.com/watch?v=BNHHrgX_6cs&feature=related
http://www.youtube.com/watch?v=8l0AUj8QUkg&NR=1&feature=fvwp
http://www.youtube.com/watch?v=Y7b_nTaZYcU&feature=related

As you can see, this issue spans plasma TVs, as well as large and small LCD TVs and monitors.
The parts are cheap, and skill required is minimal.

Posted on Mar 17, 2011

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Related Questions:

1 Answer

The screen is black.


Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

Feb 16, 2016 | Insignia NS-LCD37 37 in. LCD TV

1 Answer

I have a insignia ns-lcd37-09 tv.The screen suddenly turned green.I can here sound but no picture.can you help?


Change input device to some other which you know works for sure. If problem persists, try changing the channel. If you notice same problem, this may need attention by a qualified service technician.

Jul 21, 2012 | Insignia NS-LCD37 37 in. LCD TV

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I have a Insignia NS-LCD37 for the past 3-4 years and last night i turned it on and got zero sound. I unplugged it and turned it back on and then the sound worked. then a few hours later I turned it on...


Two options - open it up if you have electronics experience - replace the AV board or trouble shoot the board for bad components. Usually this is hard to do without the proper tools and training. you can check to see if it has busted/bulged/leaking capacitors though...

thanks,
michael

Apr 16, 2011 | Insignia NS-LCD37 37 in. LCD TV

1 Answer

I have an insignia ns-lcd37-07 giving to me, i replaced power supply board and i still don't get anything. what should be my next step?


Now the tv is turn on,tv have power LED light indicaton but no picture?Still have a clicking sound but no picture on the tv LCD screen panel?Yes,than the tv Tuner signal board that the other board 70% also might have the problems too.That the board where the incomming broadcasting signal cable plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish tv Tuner signal board for the replacement.

Apr 13, 2011 | Insignia NS-LCD37 37 in. LCD TV

1 Answer

I have a rainbow of colors on my screen and thats all it will do now... can it be the lcd controler board!!!!!?????


Could be the the panel drivr board. Try diferent nin puts, it also could be the TV main board.

Feb 17, 2011 | Insignia NS-LCD37 37 in. LCD TV

1 Answer

I have lcd37 . no pictures only sound


Ur LCD inverter backlight board is dead.Replaced this LCD inverter board will get ur picture back.Tries Shopjimmy.com,Ebay.com to buy a refurbish LCD Inverter board for the replacement.It useally long shape board.

Mar 11, 2010 | Samsung LE37S71 37 in. HD-Ready LCD TV

1 Answer

No picture only a sound


Usually this means that your LCD panel in your TV is bad. The only way to fix it is to replace the LCD panel.

If you can get a hold of the T-con board, which is part of the LCD panel that decodes the signal form the main board, then replacing that will save you some money and should fix the problem. The LCD panel is very expensive and usually exceeds the cost of the TV.

Oct 13, 2009 | Insignia NS-LCD37 37 in. LCD TV

1 Answer

Insignia NS-LCD37 TV - no sound


Start checking the cable connection to receiver, try moving or replacing cables.

If you have a surround with external speakers check surround connection cable and speakers wiring.

If the cables are OK, then the unit may be faulty.

In that case the fault can be either the audio board (often audio circuit is integrated on the main board) , or the sinput output signal board.
Also a contact on connection to internal speakers can give you same problem.

May 22, 2009 | Insignia NS-LCD37 37 in. LCD TV

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